Rashi on Numbers 11:4/רש"י על במדבר י״א:ד׳

1והאספסף AND THE THRONG — This was the mixed multitude that had gathered themselves unto them when they left Egypt (the word is from the root אסף, “to gather”) (Sifrei Bamidbar 86). — The next words of the Biblical text must be inverted to read as follows:

2וישבו גם בני ישראל ויבכו AND THE CHILDREN OF ISRAEL ALSO AGAIN WEPT together with them.

3מי יאכלנו בשר WHO SHALL GIVE US FLESH TO EAT? — But did they not have flesh? Has it not been already stated, (Exodus 12:38) “and a mixed multitude went up with them and flocks and herds, [even very much cattle]”?! If you say, “They had already eaten them”, then I reply, “But is it not stated at a later period, when they were about to enter the Land, (Numbers 32:1), “Now the children of Reuben had cattle in a very great multitude”? But the truth is that they were only seeking a pretext (Sifrei Bamidbar 86).